[Haskell-cafe] trivial function application question

tphyahoo tphyahoo at gmail.com
Fri Jan 5 01:37:24 EST 2007

So the core question (speaking as a perler) is how do you write

  my $s= 'abcdefg';
  $s =~ s/a/z/g;
  $s =~ s/b/y/g;
  print "$s\n";

 in haskell? There are various haskell regex libraries out there,
 including ones that advertise they are PCRE (Perl Compatible Reg Ex).

 But which one to use? How hard to install? With the libs mentioned
 above, the "PCRE"-ness seems only to be for matching, not for


 So, I would like to know a good answer to this as well.


brad clawsie-2 wrote:
> greetings to this helpful and informative list
> i have a small problem that will be certainly trivial for almost
> everyone reading this, i would appreciate a little help
> lets say i have a string
> s = "abcdefg"
> now i have two lists of strings, one a list of patterns to match, and
> a list of replacement strings:
> patterns = ["a","b"]
> replace = ["Z","Y"]
> from which my intent is that "a" be replaced by "Z", "b" by "Y" etc
> now using the replace function from MissingH.Str (which i know is now 
> renamed), i wish to apply replace to s using (pattern[0], replace[0]), 
> (pattern[1], replace[1])...(pattern[N], replace[N]).
> i am sure there is an elegant way to apply replace to s for all of
> these argument pairs without composing replace N times myself, but the
> solution escapes me.
> thanks in advance for any help you can provide for this trivial issue
> brad
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> Haskell-Cafe at haskell.org
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